RKI Instruments 65-2397RK User Manual

65-2397RK

Part Number: 71-0185RK
Revision: B
Released: 7/18/14

CO2 Transmitter

Operator’s Manual

RKI Instruments, Inc.

www.rkiinstruments.com

WARNING

Read and understand this instruction manual before
operating transmitter. Improper use of the transmitter could
result in bodily harm or death.

Periodic calibration and maintenance of the transmitter is
essential for proper operation and correct readings. Please
calibrate and maintain this tra nsmitt er regula rly! Frequency
of calibration depends upon the type of use you have and
the sensor types. Typical calibration frequencies for most
applications are between 6 and 12 months, but can be
required more often or less often based on your usage.

65-2397RK CO2 Transmitter

Product Warranty

RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year fr o m date of shipment
from RKI Instruments, Inc. Any parts found defective withi n tha t period will be repaired
or replaced, at our option, free of charge. This warranty does not apply to those items
which by their nature are subject to deterioration or consumption in normal ser v ice, and
which must be cleaned, repaired, or replaced on a routine basis. Examples of such items
are:

W arranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with the operator’s manual. This warranty indicates
the full extent of our liability , a nd we are not r esponsible for removal or r eplacement costs,
local repair costs, transportation costs, or contingent expenses incurred without our prior
approval.

a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER
WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED,
AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF
RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,
INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF
ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR
OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by authorized distributors,
dealers, and representatives as appointed by RKI Instruments, Inc.

We do not assume i ndemnification for a ny accident or damag e c au sed by the operatio n of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.

65-2397RK CO2 Transmitter

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CO2 Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Mounting the CO2 Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Wiring the CO

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Replacing Components of the CO

Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

65-2397RK CO2 Transmitter

Overview

This manual describes t he 65 -23 97R K CO2 transmitter. This manual also des cribes how to
install, start up, configure, maintain, and calibrate the transmitter when it is used with a

gas monitoring controller. A parts list at the end of this manual lists replacement parts and
accessories for the CO

Specifications

Table 1 lists specifications for the CO2 transmitter.

transmitter.

2

Table 1:Specifications

Description Specification

Target Gas Carbon Dioxide (CO
Sampling Method Diffusion

Signal Output 4 to 20 mA
Detection Range 65-2397RK-02: 0-5,000 ppm

65-2397RK-03: 0-5% Volume
65-2397RK-05: 0-50% Volume

65-2397RK-10: 0-100% Volume
Response Time 90% in 45 seconds
Operating Temperature

Accuracy ± 5% of reading or ± 2% of full scale (whichever is gr eater)

-4°F to 122°F (-20°C to 50°C)

)

2

W ARNING: When using the 65-2397RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2397RK and to
minimize the risk of personal injury. Be sure to maintain and period ically
calibrate the 65-2397RK as described in t hi s manual.

65-2397RK CO2 Transm itter • 1

Description

l

F

This section describes the components of the CO2 transmitter. The transmitter is a 4 - 20
mA type detector head. It consists of the CO

detector, amplifier, and junction box.

2

Factory Adjust Pot

Span Pot

Ze ro P ot

Factory Adjust Pot

Jumper Pins,

actory UseOnly

+ Test Point

- Test Point

Controller Terminal Strip

Amplifier

SPAN

ZERO

Sensor

Current

mA

S

PWR / SIG

G

LEL

R W B

Detector Termina
Strip

J-Box

IR CO2Detector

Figure 1: CO2 Transmitter Component Location

Infrared CO2 Detector

The CO2 detector consists of the detector housing body, detector housing cap, cap gasket,
and the plug-in sensor.

2 • 65-2397RK CO2 Transmitter

Detector Housing Body

Cap Gasket

Plug-In CO2 Sensor

Sensor Retainer

Detector Housing Cap

Hydrophobic
Membrane

Figure 2: CO2 Detector Component Location

Detector Housing Body

The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the CO

hub on the bottom of the junction box. Four color coded leads, red, white, green, and
black, extend from the other end of the detector. The leads allow you to connect the
detector to the amplifier.

The housing includes three sockets installed on a circuit board. These sockets accept the
plug-in sensor’s three pins to provide an electrical connection for the sensor. The circuit
board with the sockets conditions the sensor’s signal before the signal reaches the
amplifier.

Housing Cap & Cap Gasket

The housing cap screws onto the detector housing. It retains the plug-in sensor and
protects it from damage. A foam gasket is installed inside the ho using cap that seals
against the sensor face. A hydrophobic membrane on the outside of the cap face keeps
water and particulates away from the sensor face behind the cap. Unscrew the detector
cap to access the plug-in sensor for maintenance or replacement. A cap gasket seals the
interface between the housing and cap.

Plug-In CO

The plug-in sensor is secured in the detector assembly by the housing cap. The se nsor
produces a millivolt output that corresponds to the detection range of the transmitter.

Sensor

2

detector into the 3/4” NPT

2

Amplifier

The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that
corresponds to the detection range and transmits the signal to a gas monitoring controller .
A foam gasket that orients the amplifier and keeps it from rotating is installed on the

65-2397RK CO2 Transm itter • 3